% token.tex

% \usepackage{graphicx}
\begin{table}[]
  \centering
  %\resizebox{\textwidth}{!}{%
  \begin{tabular}{|c|c|c|}
    \hline
    {\bf 词法单元} & {\bf 规约 (非形式化)} & {\bf 词素 (举例)} 
    \\ \hline \hline
    \id &  &  \\ \hline
    \ws &  &  \\ \hline
    \num &  &  \\ \hline
     &  &  \\ \hline
     &  &  \\ \hline
     &  &  \\ \hline
  \end{tabular}%
  %}
\end{table}